Place all ingredients, except pepper, into a high speed blender. I like to pulse that in at the end.
Blend on high until nice and smooth. The heat from the blender will heat it up but you can also heat over the stove a little if you prefer. Heat over low because it will thicken a bit. Add more broth as needed.
Serve over your favorite pasta or any other way you want!
Notes
If you don’t have a high speed blender, soak the cashews overnight to soften them. You can also boil them for 20-25 minutes if you forget. Another method is using a coffee or spice grinder to grind them dry (not soaking) into a very fine powder.
I used red potatoes but any starchy potato will work, just don’t use sweet.
If you reheat this on the stove, it will thicken a bit. Heat slowly over low heat and add more broth if needed.